<template>
	<view>
		<view class="search-box">
			<uni-search-bar @input="input" :radius="100" cancelButton="none"></uni-search-bar>
		</view>
		
		<!-- 搜索建议列表-->
		<view class="sugg-list" v-if="searchResults.length !==0">
			<view class="sugg-item" v-for="(item,index) in searchResults" :key="index"
			@click="gotoDetail(item)">
				<view class="goods-name">{{item.goods_name}}</view>
				<uni-icons type="arrowright" size="16"></uni-icons>
			</view>
		</view>
		<!-- 搜索历史 -->
		<view class="history-box" v-else>
			<!-- 标题区 -->
			<view class="history-title">
				<text>搜索历史</text>
				<uni-icons type="trash" size="17" @click="clean"></uni-icons>
			</view>
			<!-- 列表区 -->
			<view class="history-list">
				<uni-tag :text="item" v-for="(item,index) in history" :key="index" @click="gotoGoodsList(item)"></uni-tag>
			</view>
		</view>
	</view>
</template>


<script>
	export default {
		data() {
			return {
				// 延时器
				timer: null,
				kw: '', //搜索关键词
				searchResults: [], //多个搜索结果
				historyList: ['a','app','apple'], //搜索历史的数组
			};
		},
		computed: {
			history() {
				return [...this.historyList].reverse()
			}
		},
		// 对搜索历史数据 进行持久化的存在
		onLoad() {
			this.historyList = JSON.parse(uni.getStorageSync('kw') || '[]')
		},
		methods: {
			// input输入事件
			input(e) {
				// 清除延时器
				clearTimeout(this.timer)
				// 重新启动一个延时器。并把timerId赋值给 this.timer
				this.timer = setTimeout(() => {
					this.kw = e
					this.getSearchList()
				}, 500)
			},
			async getSearchList() {
				// 判断是否为空
				if (this.kw.length === 0 ) {
					this.searchResults = []
					return
				}
				const {data: res} = await uni.$http.get('/api/public/v1/goods/qsearch', {
					query: this.kw
				})
				if (res.meta.status !== 200) return uni.$showMsg() //提示错误消息
				this.searchResults=res.message
				// 查询到搜索结构之后，保存搜索关键字
				this.seaveSearchHistory()
			},
			gotoDetail(item) {
				console.log(item.goods_id);
				uni.navigateTo({
					url:`/subpkg/goods_detall/goods_detall?goods_id=` +item.goods_id
				})
			},
			seaveSearchHistory(){
				// this.historyList.push(this.kw)
				const set = new Set(this.historyList)
				console.log(set);
				set.delete(this.kw)
				set.add(this.kw)
				this.historyList=Array.from(set)
				
				// 对历史数据进行持久化存储
				uni.setStorageSync('kw',JSON.stringify(this.historyList))
			},
			clean(){
				this.historyList = []
				uni.setStorageSync('kw','[]')
			},
			// 跳转页面
			gotoGoodsList(kw){
				uni.navigateTo({
					url:`/subpkg/goods_list/goods_list?query=`+ kw
				})
			}
		}
	}
</script>

<style lang="scss">
	.search-box {
		position: sticky;
		top: 0;
		z-index: 99;
	}

	.sugg-list {
		padding: 0 5px;

		.sugg-item {
			font-size: 12px;
			padding: 13px 0;
			border-bottom: 1px solid #efefef;
			display: flex;
			align-items: center;
			justify-content: space-between;

			.goods-name {
				// 文字不允许换行
				white-space: nowrap;
				// 溢出部分隐藏
				overflow: hidden;
				// 超出文本后用...代替
				text-overflow: ellipsis;
				margin-right: 3px;
			}
		}
	}

	.history-box {
		padding: 0 5px;

		.history-title {
			display: flex;
			justify-content: space-between;
			align-items: center;
			height: 40px;
			font-size: 13px;
			border-bottom: 1px solid #efefef;
		}

		.history-list {
			display: flex;
			flex-wrap: wrap;
			.uni-tag{
				margin-top: 5px;
				margin-right: 5px;
			}
			.history-item {
				box-sizing: border-box;
				display: inline-block;
				padding: 12px;
				position: relative;

				.history-txt {
					display: inline-block;
					font-size: 12px;
				}
			}
		}
	}
</style>